How to transfer musics from iDownloader on my iPhone 6 to iTunes?

How to transfer musics from iDownloader on my iPhone 6 to iTunes?

Added (1). Both updated!

Connect your phone to your PC.
Launch iTunes
Choose your device at the top left.
Go to the apps tab.
There should be a list at the bottom of apps that have storage files. If idownloader is there it's files should show up too. Drag and drop them out and drag and drop the mo3's right back into your iTunes library.